A flexible closed plastic pouch forming an expulsion means for supplying dispensing pressure, holding a product, closed by an aerosol valve. A plurality of pocket members disposed at spaced positions within said pouch with their openings facing the interior of the pouch. Each pocket member having an...http://www.google.com/patents/US5263519?utm_source=gb-gplus-sharePatent US5263519 - Ready to fill pressurized dispenser and method

A flexible closed plastic pouch forming an expulsion means for supplying dispensing pressure, holding a product, closed by an aerosol valve. A plurality of pocket members disposed at spaced positions within said pouch with their openings facing the interior of the pouch. Each pocket member having an extension of a predetermined length attached at its end to the interior of first of two facing wall members of the pouch. Each pocket member enclosing a predetermined quantity of first component of a two-component gas generation system and being releasably closed by one of a plurality of closure members, each of said closure members having an extension of a predetermined length attached at its end to the interior of the second of the two facing walls of the pouch. The pouch contains a second component of said two-component gas generation system and a starting means encapsulated within a delay means or device to initially generate a predetermined quantity of pressurizing gas after a delay of a predetermined period of time. The pressurizing gas inflates and expands the pouch within the container under pressure. Due to the dispensing of the product, the pouch expands further and causes sequential separation of the pocket members from their closure members and serial opening of each pocket member to add predetermined quantities of aliquot of the first component to the second component and further generate additional quantities of pressurizing gas. The internal pressure within the container is maintained substantially within a range of predetermined maximum and minimum pressure levels until dispensing the product from the container is complete, at which time, the walls of the pouch substantially lining the interior of the container. A device inside the container prevent the pouch from expanding before the product is filled into the container.

Images(5)

Claims(24)

What is claimed is:

1. In a ready to fill aerosol type dispenser, closed by an aerosol valve internal expulsion means for and maintaining gaseous dispensing pressure ranging substantially between predetermined maximum and minimum pressure levels for a produce within a container of the dispenser, said expulsion means comprising an enclosed fluid impermeable, flexible closed pouch disposed within said dispenser and having a pair of facing wall members, a plurality of pocket members disposed within said pouch in spaced relation to one another and affixed to the interior of a first of said pair of facing wall members of said pouch, a predetermined quantity of a first component of a two-component gas generation system disposed within each of said pocket members, closure members associated with the interior of the second of said pair of said facing wall members of said pouch closing each of said pocket members and releasably adhering to their contacting surfaces, thereby forming a plurality of closed pocket members each containing a predetermined quantity of said first component of said two-component gas generation system, a predetermined quantity of a second component of said two-component gas generation system disposed within said pouch and externally of said closed pocket members, said second component of said two-component gas generation system includes an ingredient in a frozen state when deposited in said pouch and subsequently liquifies, a starting delay device carrying a predetermined quantity of said first component disposed within said pouch in contact with said predetermined quantity of said second component of said two-component gas generation system for causing the initial generation of gas after a prescribed period of time, said closed pocket members being sequentially separable from their respective closure members to empty their contents into admixture with said second component and to react and generate more gas as said pouch expands due to dispensing said product, said product being dispensed disposed externally of said pouch within said container,

a plurality of identifiable pairs of spots, each comprising two identifiable member spots, and one member spot is located on said first and the other member spot is located on said second of said facing wall members of said pouch,

each of said plurality of closed pocket members having a first extension of a predetermined length extending from the edge of its pocket member and is affixed at its end to said first facing wall member of said pouch at one identifiable member spot of an identifiable pair of spots of said plurality of identifiable pairs of spots, and a second extension member of a predetermined length extending from the edge of each closure member closing a respective pocket member of said plurality of closed pocket members is affixed at its end to said second facing wall member of said pouch at the other identifiable member spot of said identifiable pair of spots,

whereby, as the product is dispensed, the pouch expands and its said first and second facing wall members move away from each other under pressure, thus causing the distance between said ends of said first and second extension members of each of said closed pocket members affixed to said first and second facing wall members of said pouch to exceed the total predetermined lengths of said first and second extension memebrs of said closed pocket members, thereby, causing sequential separation of each of said pocket members from their respective closure members according to a predetermined sequence and serial opening of each of said closed pocket members, which discharge their contents sequentially and generate additional predetermined quantities of pressuring gas each time the internal pressure within said dispenser drops to a predetermined minimum pressure level,

whereby, said pouch increases in size to a predetermined capacity each time the internal pressure within said dispenser drops from predetermined maximum to predetermined minimum pressure levels,

whereby dispensing said product from said dispenser causes the internal pressure therein to alternate continuously between said predetermined minimum and maximum pressure levels,

whereby, the coordination of said range of predetermined maximum and minimum pressure levels with, the lengths of the extension members of each of said pocket and closure members of said plurality of closed pocket members, the quantity of said first component enclosed within each of said pocket members and in the starting delay device, the order of sequence of the opening of each of said clsoed pocket members, and the quantity of said second component deposited within said pouch is necessary for dispensing said product within the range of predetermined maximum and minimum pressure levels,

improvement:

a source of inert gas and gas regulator assembly,

prior to said initial generation of said pressurizing gas, said aerosol valve is connected to a source of an inert gas, said gas calibrated to pressurize the container at a predetermined pressure level not less than the pressure level to be generated by said initial generation of said pressurizing gas for preventing said expulsion means from inflating at any time before filling the product into said container,

said container has an entry port,

said product is injected by force into said container through said entry port of said container, and consequently the internal pressure level not less than the pressure generated by said initial generation of pressurizing gas,

said product being dispensed when said aerosol valve is opened and the gas content in the head space of the container escapes, thus, said pouch expands under said pressure of said initial generation of said pressurizing gas, which provides the initial force to dispense said product,

said closed pocket members being separable from their respective closure members to empty their contents into admixture with said second component and to react and generate additional quantities of pressurizing gas as said pouch expands due to dispensing said product, said pouch lines the interior of said container when dispensing said product is complete.

2. In the ready to fill aerosol type dispenser defined in claim 1 wherein, said expulsion means having one closed pocket member containing a predeterminedr quantity of said first component, said starting delay device containing a predetermined quantity of said first component and a predetermined quantity of said second component, said dispenser is assembled and sealed prior to filling said flowable prodeuct through said port of entry in the container to surround said expulsion means within said dispenser, said dispenser is pressurized internally by an inert gas at a pressure level not less than the initial pressure to be generated by the chemical reaction of the content of said starting delay device with said second component within said expulsion means.

3. In the ready to fill aerosol dispenser defined in claim 2 wherein, said expulsion means contains a starting delay device containing a predetermined quantity of said first component and a predetermined quantity of said second component, said dispenser is assembled and sealed prior to filling said flowable product therein through said port of entry in said container to surround said expulsion means within said dispenser, said dispenser is pressurized by an inert gas at a pressure level not less than the initial pressure to be generated by the chemical reaction of the content of said starting delay device with said second component within said expulsion means.

4. The invention of claim 1 wherein, the delay device for the initial generation of gas is initially insertrd in said dispenser during the assembly and removed by pressure disturbance within said dispenser.

5. The invention of claim 1 wherein, delay device for the initial generation of gas including one of said two chemical components having an inert coating that after a suitable predetermined period of time dissociates from said one chemical component and permits it to react with the other of the two chemical components.

6. The invention of claim 1 wherein, said pressurizing gas generated by a chemical reaction between two chemical components is delayed by sealing one of the chemical components within a thin glass ampule and producing a pressure disturbance sufficient to rupture said thin glass ampule within said container after said container is assembled and sealed, thereby admixing said two chemical omponents which react and generate the initial quantity of pressurizing gas.

7. The invention of claim 1 wherein, said delay device for the chemical reaction includes housing a chemical reagent in a small vial having a narrow outlet including a plug of viscous material, which can be removed by introducing pressure disturbance into the container after said container is assembled and sealed, allowing the chemical components to admix and react and generate a predetermined quantity of pressurizing gas.

8. The invention of claim 7 wherein, said plug is removed by means of a magnetic force.

9. The invention of claim 1 wherein, said delay device for the chemical reaction includes a temporary changing changing of the physical state of one or more of the chemical components which reverts to their original physical state after the dispenser is assembled and sealed.

10. The invention of claim 1 wherein, said product to be dispensed is comprised of at least one component selected from the class consisting of bromo-chloro-difluoro-methane, chlor-penta-fluoro-ethane, chloro-trifluro-methane, and dibromo-tetra-fluoro-ethane.

11. The invention of claim 1 wherein, the radioactivity at the surface of said dispenser and its component parts and accessories as well as that of the product dispensed therefrom does not exceed 0.1 milliroentgen per hour.

12. The invention of claim 1 wherein, a foraminous barrier is located under a valve intake and a perforated tubing located alongside and internally of the container to facilitate the flow of the contents in said container to said valve intake.

13. Expulsion means for developing and maintaining gaseous dispensing pressure in a container of a ready to fill dispenser for a dispensable product being dispensed from said container which is closed by an said means comprising a fluid impermeable aerosol valve, expansible flexible closed pouch adapted to be disposed within said container and having a pair of facing wall members, a plurality of pocket members disposed within said pouch in spaced relations to one another and each is affixed to the interior of a first of said facing wall members of said pouch, a predetermined quantity of a first of a two-component gas generation system disposed within each of said pocket members, a closure member for each pocket member associated with the interior of the other member of said pair of facing wall members of said pouch and closing each of said pocket members and releasably adhering to its contacting surfaces, thereby forming a plurality of closed pocket members each containing a predetermined quantity of said first component of said two-component gas generation system, a predetermined quantity of a second component of said two-component gas generation system disposed within said pouch and externally of said pocket members, said second component of said two-component gas generation system includes an ingredient in a frozen state when deposited in said pouch and subsequently it liquifies, a starting delay device carrying a predetermined quantity of said first component disposed within said pouch in contact with said second component of said two-component gas generation system for causing the initial generation of pressurizing gas after a predetermined period of time, upon outward expansion of said pouch due to the pressure of said gas generated therein and the evacuation of said dispenser by dispensing said dispensable medium, each of said closed pocket members being adapted to gradually separate from its respective closure member and open sequentially, thereby permitting their contents of aliquots of said first component to contact and react with said second component and generate additional quantities of pressurizing gas within said pouch as said pouch expands due to dispensing said product, said product being disposed externally of said pouch within said container,

a plurality of identifiable pairs of spots, each comprising two identifiable member spots, and one member spot is located on said first and the other member spot is located on said second of said facing wall members of said pouch,

each of said plurality of closed pocket members having a first extension of a predetermined length extending from the edge of its pocket member and is affixed at its end to said first facing wall member of said pouch at one identifiable member spot of an identifiable pair of spots of said plurality of identifiable pairs of spots, and a second extension member of a predetermined length extending from the edge of each closure member closing a respective pocket member of said plurality of closed pocket members is affixed at its end to said second facing wall member of said pouch at the other identifiable member spot of said identifiable pair of spots,

whereby, as the product is dispensed, the pouch expands and its said first and second facing wall members move away from each other under pressure, thus causing the distance between said ends of said first and second extension members of each of said closed pocket members affixed to said first and second facing wall members of said pouch to exceed the total predetermined lengths of said first and second extension members of said closed pocket members, thereby, causing sequential separation of each of said pocket members from their respective closure members according to a predetermined sequence and serial opening of each of said closed pocket members, which discharge their contents sequentially and generate additional predetermined quantities of pressurizing gas each time the internal pressure within said dispenser drops to a predeterimined minimum pressure level,

whereby, said pouch increases in size to a predetermined capacity each time the internal pressure within said dispenser drops from predetermined maximum to predetermined minimum pressure levels,

whereby dispensing said product from said dispenser causes the internal pressure therein to alternate continuously between said predetermined minimum and maximum pressure levels,

whereby, the coordination of said range of predetermined maximum and minimum pressure levels with, the lengths of the extension members of each of said pocket and closure members of said plurality of closed pocket members, the quantity of said first component enclosed within each of said pocket members and in the starting delay device, the order of sequence of the opening of each of said closed pocket members, and the quantity of said second component deposited within said pouch is necessary for dispensing said product within the range of predetermined maximum and minimum pressure levels,

improvement:

a source of inert gas and gas regulator assembly,

prior to said initial generation of said pressurizing gas, said aerosol valve is connected to a source of an inert gas, said gas calibrated to pressurize the container at a predetermined pressure level not less than the pressure level to be generated by said initial generation of said pressurizing gas for preventing said expulsion means from inflating at any time before filling the product into said container,

said container has an entry port,

said product is injected by force into said container through said entry port of said container, and consequently the internal pressure level not less than the pressure generated by said initial generation of pressurizing gas,

said product being dispensed when said aerosol valve is opened and the gas content in the head space of the container escapes, thus, said pouch expands under said pressure of said initial generation of said pressurizing gas, which provides the initial force to dispense said product,

said closed pocket members being separable from their respective closure members to empty their contents into admixture with said second component and to react and generate additional quantities of pressurizing gas as said pouch expands due to dispensing said product, said pouch lines the interior of said container when dispensing said product is complete.

14. The invention of claim 13 or 12 wherein, the end of each of said extension members of each of said closed pocket members of said plurality of pocket members is affixed by proportionately short heat sealed weld portions to one of two facing walls of said pouch at a predetermined spot, and each of said extension member of each of said closure members respective to said pocket members is affixed by proportionally short heat sealed portion to the other of the two facing walls of said pouch at a predetermined spot, said spots constitute two member identifiable spots of an identifable pair of spots, one of which is located on each of said facing walls of said pouch.

15. The invention of claim 1 or 13 wherein, said pouch is comprised of three-layer laminated plastic film, the external layer being Mylar polyester (0.5) to (3) mils thick, the inner layer being low density polyethylene (0.5) to (20) mils thick, and the middle layer being Saran (™) or polyvinylidine chloride deposited by spraying at least one of the inner surfaces of said Mylar and polyethylene layers.

16. The invention of claim 15 wherein, said sheet carrying said pocket members is comprised of two-layer plastic lamination having an outer layer of low density polyethylene (0.5) to (20) mils thick, and an inner layer of polypropylene (0.1) to (10) mils thick, said closure members comprised of three-layer plastic sandwich lamination having an inner Mylar polyester layer of (0.3) to (3) mils in thickness, the outer layers of the sandwich being of low density polyethylene of (0.3) to (20) mils thick.

17. The invention of claim 16 wherein, each of said pocket members and said starting delay device encapsulating said predetermined quantity of said first component of said two-component gas generation system comprising at least one compound selected from the class consisting of a water soluble mineral acid, carboxylic acid and citric acid, and said second component is comprised of at least one compound selected from the class consisting of barium carbonate, calcium carbonate and sodium bicarbonate in an aqueous medium and said generated pressurizing gas being carbon dioxide gas.

18. The invention of claim 17 wherein, each of said plurality of closed pocket members is individually separated and independent from the others.

19. The invention of claim 1 or 13 wherein, said delay device comprising at least one device selected from the class consisting of a gelatin capsule, disintegrating pouch and breakable enclosure which break open within said expulsion assembly prior to assembling the dispenser.

20. In a ready to fill aerosol type dispenser system, a container defining a dispenser closed by an aerosol valve, said valve having an intake, internal expulsion assembly for developing and maintaining gaseous dispensing pressure ranging substantially between predetermined maximum and minimum pressure levels for a flowable product within said container of the dispenser surrounding said expulsion assembly, a foraminous barrier located within said dispenser under said aerosol valve intake and a perforated tubing located alongside and internally of the dispenser to facilitate the flow of the contents within said dispenser to said valve intake, said expulsion means comprising an enclosed fluid impermeable, flexible closed pouch disposed within said dispenser and having a pair of facing wall members made of low density polyethylene, a plurality of pocket members disposed within said pouch in spaced relations to one another and affixed to the interior of a first and said pair of a facing wall members of said pouch, a predetermined quantity of a first component of a two-component gas generation system disposed within each of said pocket members, closure members associated with the interior of said second of said pair of facing wall members of said pouch closing each of said pocket members and releasably adhering to their contacting surfaces, thereby forming a plurality of closed pocket members each containing a predetermined quantity of said first component, a predetermined quantity of a second chemical component of said two-component gas generation system disposed at the bottom within said pouch and externally of said closed pocket members, said second component includes an ingredient in a frozen state when deposited in said pouch and subsequently liquifies, after said dispenser is assembled and sealed and said flowable product is injected by force into said container of the dispenser through a port of entry in sawid container, the initial generation of said pressurizing gas is activated by means of vacuum by force into said container of the dispenser through a port of entry in sawid container, the initial generation of said pressurizing gas is activated by means of vacuum activation process, said closed pocket members being sequentially separable from their respective closure members to empty their contents into admixture with said second component and to react and generate additional gas as said pouch expands due to dispensing said product when said aerosol valve is switched to an open position, said plurality of pocket members is formed on a plastic sheet comprised of two-layer plastic lamination having an outer layer of low density polyethylene affixed to the interior of said first and said pair of facing wall members of said pouch and an inner layer of polypropylene, said closure members comprised of three-layer plastic sandwich lamination having an inner Mylar polyester layer, the outer layers of said sandwich being of a low density polyetylene formed by heat sealing, so that the low density polyethylene adhers releasably to polypropylene, each of said plurality of pocket members and their particular closure members having an extension heat sealed permanently to the interior of first and second facing walls of said pouch respectively, the length of each said extensions is coordinated with the pressure generated in the dispenser and the quantity of product dispensed.

21. In the dispenser defined in claim 20 wherein, said initial generation of said pressurizing gas is activated by means of vacuum activation process is performed by partitioning said expulsion assembly by means of a peelable partition into two subcompartments, one upper subcompartment and one lower subcompartment, one of said subcompartments, the lower subcompartment containing a predetermined quantity of said second chemical component and is suitably inflated with gaseous material prior to partitioning said expulsion assembly, a predetermined quantity of said first component deposited within said upper subcompartment outside said plurality of closed pocket members, whereby gaseous material in the upper subcompartment is purged before said expulsion assembly is closed by a permanent closure formed by heat sealing an open end of the upper subcompartment, after said dispenser is assembled and sealed and said flowable product is filled through a port of entry in said container, a vacuum is pulled through said aerosol valve of said dispenser, and the gaseous content external of said expulsion assembly is reduced, creating parallel pressure around said expulsion assembly, whereby said subcompartment containing said gaseous material expands and ruptures said peelable partition therebetween and allows said two-components to admix and react and thereby generate said initial pressurizing gas which provides the force to dispense said flowable product from said dispenser when said aerosol valve is switched to an open position, said peelable partition is formed by including a step of reducing at least one requirement selecetd from the class consisting of predetermined degree of temperature, the level of pressure and the length of the period of time of the dwell of the hot jaws of the heat sealing machine on the area to be peelably heat sealed, which are required to create permanent heat seal.

22. In the aerosol dispenser defined in claim 21 wherein, said peelable partition comprises polypropylene plastic material inserted between the two facing walls of said expulsion assembly in the area where said heat sealed peelable partition is to be located for forming said two subcompartments, said polypropylene plastic material incompatible with said two facing walls of low density polyethylene of said expulsion assembly.

23. In the aerosol dispenser described in claim 22 wherein, said dividing of said expulsion assembly into two subcompartments is produced by closing a small pouch by a peelable closure and inserting it within said expulsion assembly, said small pouch containing a predetermined quantity of said first chemical component and is inflated with a predetermined quantity of gaseous material and having two facing walls made of low density polyethylene, said second component is deposited in said expulsion assembly, gaseous material outside said small pouch within said expulsion assembly is purged before said expulsion assembly is closed by a permanent heat seal closure at its open end, after said dispenser is assembled and sealed and said flowable product is filled through a port of entry in said container, a vacuum is pulled through said aerosol valve of said dispenser, and the gaseous content therein externally of said expulsion assembly is reduced, creating partial pressure around said expulsion assembly, whereby said small pouch ruptures and allows the two chemical components to react.

24. In the aerosol dispenser defined in claim 23 wherein, said closing of said small pouch by heat sealed peelable closure is formed by means of inserting a polypropylene plastic material between said two facing walls of said small pouch and heat sealing it at open end.

Description

This is a continuation-in-part of U.S. patent application Ser. No. 07/494,831, dated Mar. 16, 1990, now U.S. Pat. No. 5,022,564 entitled "A SELF REGULATED PRESSURIZED DISPENSER AND METHOD", WHICH HAS BEEN allowed; which is in turn a continuation-in-part of Ser. No. 07/021,617, now U.S. Pat. No. 4,909,420 filed on Mar. 2, 1987; which in turn is a CIP of Ser. No. 06/671,048 filed Nov. 13, 1984, now U.S. Pat. No. 4,646,946; which in turn is a CIP of Ser. No. 06/413,498 filed Sep. 2, 1982, now abandoned.

BACKGROUND OF THE INVENTION

For a long time there has been a need for a ready to fill pressurized dispenser system for use in a container dispensing a product that is isolated from the propellant and is not dispensed with, the product. Environmental considerations and safety precautions, as well as physical or chemical incompatibilities, toxicity, and contamination are some of the factors which emphasized this need.

Most other aerosol type dispensers generally were operable only in an upright position, otherwise premature exhaustion of the dispensing medium would result with a substantial loss of usable product which would remain indispensable in the container due to loss of dispensing pressure.

Dispensers pressurized with propellants have other deficiencies such as incompatibilities, non-uniform dispensing pressure, temperature sensitivity, leakage and unreliability and solubility problems.

The present invention provides a dispensing mechanism which overcomes the above-mentioned deficiencies of the prior art devices and provides additional novel features and advantages, and a wider range of uses, than were possible with devices used heretofore.

BRIEF SUMMARY OF THE INVENTION

Expulsion means for developing and substantially maintaining within predetermined maximum and minimum range gaseous dispensing pressure in a container from which a product is to be dispensed, comprising an enclosed fluid impermeable flexible pouch disposed within the container and having a pair of facing wall members. A plurality of pocket members in spaced relation to one another, each contains a predetermined quantity of first component of a two component gas generation mixture, and a closure member releasably closes each of said pocket members. This plurality of closed pocket members is disposed within the pouch, and each has a pocket extension member and a closure extension member affixed by weld portions to a predetermined spot on the interior of one of the facing wall members of the pouch. The first component of the two-component gas generation mixture is e.g. citric acid. The second component of said two-component gas generation mixture is e.g. sodium bicarbonate and water is disposed within the pouch and externally of said closed pocket members. When these two components are mixed, they react and generate carbon dioxide gas. Starting delay means, e.g., a rupturable or dissolvable capsule containing a predetermined quantity of the first component, e.g. citric acid, is disposed within the pouch in contact with the second component for causing the initial generation of carbon dioxide gas after a prescribed period of time. As the product is discharged intermittantly from the container, the pouch inflates and gradually expands in increments and displaces the product evacuated from the container. Each pocket member sequentially separates from its respective closure member as the pouch expands within the container to thereby open and empty its content into admixture with the second component to react and generate an additional predetermined quantity of pressurizing carbon dioxide gas within pouch (27).

However, before the prescribed period of time elapses, the container is pressurized with inert gas, such as nitrogen gas, at a pressure not less than that resulting from the initial generation of the carbon dioxide gas, in order to prevent the pouch from expanding before the product is filled into the container.

One object of the present invention is to provide a dispensing mechanism to fill in the need of providing consumer products pressurized under maximum and minimum pressure levels.

Another object of this invention is to provide dispensing mechanism to fill the void where there is no suitable propellant for specific products required to be dispensed under specific pressure levels.

Another object of this invention is to provide a safe and efficient pressurized system which conforms with the laws and regulations of various government agencies.

Another object of this invention is to provide a ready to fill pressurized dispenser.

Other objects of the precise nature of the present invention will become evident from the following description and accompanying drawings in which each of the various components has the same reference numeral in their different views.

DESCRIPTION OF THE DRAWINGS

FIG. 1 is an elevation sectional view of an aerosol dispensing container including an expulsion means embodiment of the present invention shown in a fragmentary cutaway view;

FIG. 2 is a sectional plan view of the structure shown in FIG. 1 showing the expulsion means in initial collapsed condition.

FIG. 3 is a sectional plan view of the structure shown in FIG. 2, showing the expulsion means in intermediate expanded condition;

FIG. 4 is an enlarged isometric view of the two envelope sheets of an embodiment of the invention prior to assembly;

FIG. 5 is an enlarged isometric view of the two envelope sheets of FIG. 4 in assembled condition;

FIG. 6 is a sectional view taken along lines 6--6 of FIG. 5;

FIG. 7 is an enlarged schematic representation showing, the method of insertion of the envelope into the pouch;

FIG. 8 is an enlarged schematic representation, showing heat sealing of the envelope sides to the inner walls of the pouch;

FIGS. 12 and 13 are enlarged fragmentary schematic views showing separation of the envelope sides during expansion of the pouch to open the pocket members;

FIG. 14 is another cross section view of the structure shown in FIG. 1, showing the expulsion means in initial collapsed condition.

FIG. 15 is another sectional plan view of the device shown in FIG. 1, showing the expulsion means in intermediate expanded condition. Also shown are the exterior surfaces of the extensions of the pocket and closure members attached to the interior of the facing walls of the pouch.

FIG. 16 is a schematic representation of an arrangement of the closure members and the pattern of attachment of the exterior sides of their extensions to the interior of the facing wall of the pouch.

FIG. 17 is a schematic representation of the arrangement of a plurality of envelopes, independent from each other disposed within the pouch and each having a single pocket member.

FIG. 18 is an elevation sectional view of a pressurizing gas regulator assembly.

FIG. 19 is an elevation sectional view of an inflated small pouch within the expulsion assembly.

DETAILED DESCRIPTION

Referring to the drawings, in which each of the various components has the same reference numeral in the different views, and in particular FIGS. 1-3, a fluid impermeable dispensing container is shown and designated generally by reference (10). Container (10) has a cylindrical body or side wall (11) inwardly dished bottom (12) and bell-shaped top (13) in which is mounted a conventional spring aerosol valve assembly (14). Container (10) and its component parts just described can be fabricated from any suitable material such as thin gauge aluminum or other metal, or even plastics, depending on the product to be dispensed and any governing safety specifications that might be involved. Aerosol valve assembly (14) is of conventional design having plunger and spray head (15) carrying spray orifice 16, suitably constructed of plastic material, and internal parts (not shown) such as a spring, ball valve and mounting ring (17) and bottom intake member (18) which may be of metal and/or plastic consistent with the previously mentioned requirements.

Within container (10) is expulsion assembly (20) which is the subject of the present invention and as will be seen, generates and maintains gas pressure therein to enable product (19) to be dispensed on demand, substantially under a range of predetermined maximum and minimum pressure levels.

At the upper end (21) of the interior of cylindrical body (11) is a perforated or foraminous barrier member (22) having a plurality of holes (23) distributed throughout its surface. Also located along inner surface (24) of sidewall (11) and extending longitudinally there along is a perforate tube member (25) having a plurality of holes (26) at spaced positions around and along said tube member (25). The function of barrier member (22) and tube member (25) is to insure trouble-free operation of the dispenser and prevent expulsion assembly (20), as it expands in the manner to be described, from blocking off or plugging the interior of the container either laterally/circumferentially or plugging off valve bottom intake member (18).

Expulsion assembly as shown in FIG. 1 is disposed within container (10) without being attached or anchored to container (10), although it may, if desired be so connected. Assembly (20) is comprised of generally regular envelope, bag or pouch (27) which is constructed of a flexible, fluid impermeable plastic material, such as, for example, polyethylene or polyester and may be fabricated from a sheet of plastic by folding it into overlaid halves (27a), 27b) which are then sealed or adhered by suitable means along their respective contacting side, bottom and top edges (28), (29), (30) respectively to form sealed enclosure as shown in FIG. (1) to (3) inclusive.

Disposed within pouch (27) is fluid impermeable flexible plastic sandwich or enfoldment (31), having a pair of facing wall members (32) and (33) releasably adhered to one another--(see also FIGS. (2) through (6) and permanently attached on their exterior surfaces by suitable means, such as heat sealed portions (35) to respective interior sides (27c) and 27d) respectively of pouch 27. Portions of one wall member (33) have plurality of cup-shaped depressions, cavities or pocket members (34) disposed inwardly from one surface thereof at spaced positions, and other portions of wall member (33), each forms an extension member (a) as in FIG. (15), to each pocket member Each extension member extends from the edge of the opening of its respective pocket member to the edge of wall member (33). Each extension ends at a predetermined distance from the edge of the opening of its pocket member. Each extension is affixed permanently at its end by one of weld portions (35) to predetermined locations or spots on the interior wall (27d). These spots on interior wall (27d) are located on the same locations as weld portions (35) shown in the drawing and are superimposed and concealed by them. They may be referred to in the drawings by the same numeral (35). The other wall member (32) is substantially flat and has lidding area members or closure members which close each of the respective facing member of pockets (34) and releasably adhered to it. Pocket members (34) are superimposed on these closure members in the drawings, see FIG. (17). Other areas of wall member (32), each forms an extension member (b) as in FIG. (15), to closure member. Each closure extension member extends from the edge of the closure member to the edge of wall member (32). Each extension ends at a predetermined distance from the edge of its closure member. Each extension is affixed permanently at its end by one of weld portions (35) to a predetermined location or spot on interior wall (27c). These spots on interior wall (27c) are on the same locations and are superimposed by weld portions (35) in the drawings. They may be referred to in the drawings by the same numeral (35). Each of pocket members (34) is releasably closed by wall member (32) to encapsulate within each of pocket members (34) a predetermined quantity of aliquot of component (36), which may be either in the form of powder or a solution. Disposed within pouch (27) is component (37) including a solvent. Also disposed within pouch (27) and mixed with component (37) is starting delay means or device (38), which as shown is in the form of dissovable capsule and contains an initial charge of component (36). Pouch (27) is then closed by sealing its open end.

It is to be understood that cavities or pocket members (34)and capsule (38) may carry component (36), e.g. citric acid in powder form or in solution, and component (37) may be sodium bicarbonate and water, or the two carbon dioxide gas generating components can be switched the other way around.

A pressurizing gas regulator assembly of a conventional design 39 equipped with an escape valve 46 is to be connected to the aerosol valve 14 fixed on container 10. Regulator assembly 39 presses valve 14 to an open position for the purpose of maintaining an unobstructed flow of gas between the interior of container 10 and regulator assembly 39 in order to make possible adjusting and maintaining a predetermined pressure within container 10.

Arm 43 of regulator assembly 39 balancing on axis 41 to open or close escape valve 46 by means of end 45 of arm 44. Axis 41 is supported by an extension bolted to regulator assembly 39 with bolt 40.

Arm 43 having on its outer surface a graduated threaded area for identifying where a unit weight 42 should be positioned for the purpose of regulating regulator assembly 39 in order to maintain the desired predetermined pressure within container 10. Unit weight 42 is threaded internally and can be moved towards either ends on arm 43.

A source of pressurizing inert gas of not lower but slightly higher than the internal pressure desired to be maintained within container 10, is connected at opening 47 of regulator assembly 39 for the purpose of preventing the pressurizing gas therein from dropping below the predetermined pressure desired to be maintained within container 10, such inert gas may be Nitrogen.

Pouch (27), in one preferred embodiment, is constructed of a three layer laminated film having a middle layer of saran, an external layer of Mylar about 0.5 mils thick, and the inside layer (the interior of the pouch) being low density polyethylene of about 1.5 mils thick, and the SARAN(™) layer is only deposited from spray. The characteristics required or desired in said pouch is that it be non-toxic, has sufficient mechanical strength and chemical stability, and flexible but not appreciably stretchable, and the interior facing surfaces of the pouch be heat sealable. Pouch (27) can also be constructed from other films such as impervious or non-impervious, non-laminated or laminated with plastics, foil or treated fabrics or other suitable material which may be available. Saran (™) chemical name is Polyvinylidine Chloride (PVDC).

Wall member (32) is fabricated from the same material which contacts the interior of pouch (27) and is of compatible plastic material, e.g. low density polyethylene. In one preferred embodiment, it has an overall thickness of about 4.5 mils and is a three layer sandwich of about 0.5 mils mylar in the middle and about 2.0 mils of low density polyethylene on either sides. Wall member (32) may also be constructed from other films such as impervious or non-impervious, coated or non-coated, laminated with plastics, foil or treated fabrics or any other suitable material which may be available.

Wall member (33), carrying the cup-shaped depressions or pocket members (34), adapted for deep drawing and is in one preferred embodiment a laminated plastic sheet having an exterior layer--(the layer in contact with the interior of pouch (27)--of low density polyethylene of about 0.5 mils to about 20 mils thick and an interior layer (the other side) of polypropylene of from about 0.1 mils to about 3.75 mils thick or higher. Wall member (33) may also be constructed from any other suitable material.

While for most practical applications of the invention, components (36) and (37) as citric acid and sodium bicarbonate mixed with water respectively are normally preferred, it is possible that under particular circumstances other materials may be suitable such as, for example, dilute hydrochloric acid (e.g. 10 to 30%) may replace citric acid, and lithium carbonate or calcium carbonate my replace the sodium bicarbonate. It is to be understood that component (36) may be selected from any suitable material which can react with component (37) and generate a pressurizing gas, and the contents of each of pocket members (34) and capsule (38) may be the same material or different from each other.

The radio-activity at the surface of the dispenser and its component parts and accessories as well as that of the product discharged therefrom is within human tolerance, and does not exceed 0.1 milliroentgen per hour at the time of manufacturing. This requirement may be obtained by blending materials of lower level radio-activity than the level required with materials of higher level radio-activity than the level required in order to produce blended materials of the required low level radio-activity.

Capsule (38), which functions as the starting delay means or device, may be constructed from any suitable material, such as gelatin, or coating such as shellac, or any breachable or breakable barrier enclosure.

As required by the manufacturer, the delay period of time may be extended. This is done by pressurizing container (10) to a pressure level not less than the pressure level caused by the initial generation of the pressurizing gas.

Following are other delay devices which may be suitably utilized.

Various starting delay means can be employed in addition to dissolvable capsule 38. Among the delaying processes which may be employed to delay for a predetermined period of time the chemical reaction such as that of sodium bicarbonate and the citric acid and an aqueous medium or any other combinations from reacting are:

(1) Coating the surfaces of the chemical reagent with an inert material such as gelatin, shellac or any other substance which is slowly soluble or rupturable in the liquid medium. This process will delay the chemical reaction as long as the chemical reagent means are not in direct contact with each other.

As an alternative, the chemical reagent may be enclosed inside a sealed glass capsule which will break upon increasing or decreasing the internal pressure in the container. When the capsule is broken, the chemical reagent will be liberated and react with its surroundings and produce gas. Another alternative is to enclose the chemical reagent inside a small vial, the neck of which is closed by a suitable open valve attached to a dip tube and plugged with a viscous material such as petroleum jelly, which flows away upon increasing or decreasing the internal pressure in the container. Upon opening the aerosol valve of container (10), the pressure imbalance in the small vial and the container, urges the chemical means to communicate and react with each other and produce gas. A further alternative is to enclose the chemical reagent means inside a small vial plugged with a hard brittle (fragile) material which breaks upon increasing or decreasing the internal pressure in the container, which condition allows the chemical means to communicate and react with each other and produce gas. In yet another alternative, the delaying means can be a plug which closes a vial. The vial contains the chemical reagent. The plug is removable by means of a magnetic or an electromagnetic force after the container is assembled and sealed.

(2) Adding one or more of the chemical reagent means in a chemically or physically modified form, such as adding the water or the liquid medium in a frozen state. The reaction will be activated at a suitable temperature upon the liquification of the frozen medium.

(3) Introducing into the assembled package some missing factor which can start the chemical reaction which will eventually generate gas. The factor which starts the chemical reaction and is introduced into the container is one or an aggregate of the following: chemical reagents, compressed gas, anti-freeze, catalytic agent, or mere compression. In other words, this factor can be of a physical or a chemical nature or of both.

(4) Dividing the expulsion means or pouch into two separate sections by means of a peelable partition. One section, say the bottom section, contains first chemical component and a certain amount of gas or atmospheric air. The upper section of the pouch contains second chemical component, capable of reacting with the first chemical component and generate gas giving pressure, and the gaseous material contained in that part of the pouch is purged before sealing the pouch. The container is further processed and completely assembled and sealed. It is a common practice in the trade to leave head space in the containers amounting to about 10 to 15% of their capacities. When vacuum is pulled through the valve of the container, the air in the lower section of the pouch will expand and force open the peelable partition separating it from the peelable upper section. This will bring the first and second chemical components together to react and produce pressurizing gas, which process is an activation by vacuum or vacuum activation.

The method of forming in the expulsion assembly or pouch, which has the interior of its two facing walls made of low density polyethylene, two subcompartments separated by means of a heat sealed peelable partition is as follows:

I. By dividing the expulsion assembly by a peelable partition 48 into two subcompartments, one lower subcompartment and one upper subcompartment as follows:

1. The heat sealed peelable partition is formed by reducing at least one of the necessary requirements for forming permanent heat seal between the two facing walls of the expulsion assembly in the area to be peelably heat sealed. These necessary requirements comprising the degree of temperature, the pressure level and the length of the period of time of dwell of the hot jaws of the heat sealing machine on the area to be peelably heat sealed.

2. The heat sealed peelable partition is formed by inserting polypropylene plastic material between the two facing walls of this expulsion assembly in the area to be peelably heat sealed. Polypropylene plastic material is incompatible with forming permanent heat seal between two surfaces of low density polyethylene. The two facing walls of this expulsion assembly fit this description.

II. By inserting within said expulsion assembly a small pouch 49 having the interior of its facing walls made of low density polyethylene and containing a predetermined quantity of the first chemical component of the two-component gas generation system and a predetermined quantity of gaseous material, and closing it at its open end by means of heat sealed peelable closure. The expulsion assembly is closed by permanent closure after depositing therein the second chemical component of the two-component gas generation system and purging the gaseous material contained therein. The heat sealed peelable closure of the small pouch can be formed as follows:

1. By reducing at least one of the requirements which is necessary to form permanent heat seal in the area to be peelably heat sealed in the small pouch 49 as mentioned above in I, 1.

2. By inserting polypropylene plastic material between the two facing walls of the small pouch 49 in the area to be peelably heat sealed as mentioned above in I, 2.

Generating the initial quantity of pressurizing gas in this ready to fill aerosol dispenser by the vacuum activation process progresses as follows:

After the container of the dispenser is assembled and sealed, it becomes ready for injecting therein by force the flowable product through a port of entry in the container. After the flowable product is filled into the container, vacuum is pulled through the aerosol valve thereon in order to create a partial vacuum therein, the small pouch 49 within the expulsion assembly expands and breaks open its peelable closure, the first and second components admix and react and generate the initial pressurizing gas within the expulsion assembly, which inflates and expands under pressure and force the flowable product therein to be dispensed under pressure when the aerosol valve is turned to an open position. The port of entry in the container can be through its aerosol valve or any other opening in the container.

Other alternatives of the delay devices are also possible, for example, by initially excluding from the package the means to bring about the chemical reaction and introducing it into the package after the package is assembled and sealed, pressurizing gas is generated and forces the flowable product to be dispensed under pressure when the aerosol valve is switched to an open position.

(5) Assembling a part or the whole package under pressure.

Other means for delaying the chemical reaction may be suitably devised to carry out the invention.

For all practical purposes, the internal pressure within pouch (27) or expulsion means (20) is presumed to be equivalent to the internal pressure of container (10).

As capsule (38) disintegrates, its content of component (36) is released and reacts with second component (37) within pouch (27), and generates the initial predetermined quantity of pressure generating gas which raises the internal pressure therein to be predetermined maximum pressure level, and pouch (27) inflates and expands within container (10).

As product (10) is dispensed, and thereby pouch (27) expands and increases in size further and displaces the space vacated by product (19) within container (10), each quantity of component (36) encapsulated in each of closed packet members (34) is released sequentially and reacts with component (37) within pouch (27) and generates sequentially additional predetermined quantities of pressurizing gas therein each time the internal pressure within pouch (27) drops from predetermined maximum pressure level to predetermined minimum pressure level. These additional quantities of pressurizing gas raise the internal pressure within pouch (27) from predetermined minimum pressure levels to predetermined maximum pressure levels. The increases in the size of pouch (27) cause its facing walls to push outwardly, and thereby the distance between interior wall members (27c) and (27d) as well as the distances between identifiable spots on these two walls increase. Eventually the pocket members of each of closed pocket members (34) separate from their respective closure members and said closed pocket members open sequentially and discharge their contents, which react with component (37) and generate sequentially additional predetermined quantities of pressurizing gas, which raise the pressure therein to predetermined maximum levels. The internal pressure within pouch (27) alternates between predetermined maximum and minimum pressure levels, until dispensing product (19) is completed.

Method of Assembly:

The expulsion assembly is assembled as mentioned above with the delay device deposited therein and then it is closed and sealed and disposed within container 10. Then perforated tubing 25 is placed within and alongside container 10. Then container 10 is closed with a conventional aerosol type valve 14 after positioning barrier piece 22 between the top of expulsion assembly 20 and the intake of the aerosol valve 18 within container 10.

Prior to the generation of the predetermined initial quantity of pressurizing gas within expulsion assembly 20, which generates a predetermined pressure level within container 10, container 10 is pressurized with an inert type gas at a pressure level not less than the predetermined initial pressure to be generated within pouch 27 of expulsion assembly 20. Whereby, expulsion assembly 20 is prevented from inflating, and the closed cup or pocket members containing the predetermined quantities of the first component remain closed as long as the inert pressurizing gas within container 10 is maintained therein at a level not less than the predetermined initial pressure to be generated within expulsion assembly 20. Nitrogen gas is one example of a preferred inert type gas.

At the time when product 19 is injected by force through a port of entry into container 10, the gas pressure within container 10 consequently rises. A conventional metered filling machine such as the one used in filling tooth paste tubes or the like, for example, a piston machine with metered strokes may be used. The port of entry to container 10 may be through its aerosol valve or any other entry location through container 10.

Upon connecting the regulated regulator assembly 39 with aerosol valve 14 of container 10 as mentioned above, the elevated gas pressure within container 10 will flow unto regulator assembly 39 and elevate the gas pressure therein. The elevated gas pressure within regulator assembly 39 will flow out of escape valve 46 and push away or blow away end 45 of arm 44 to open escape valve 46 and allow the excessive pressurizing gas to escape. The gas pressure within container 10 will be reduced to the predetermined pressure level which regulator assembly 39 was regulated to maintain, in which case, end 45 of arm 44 closes escape valve 46.

It is to be understood that expulsion assembly 20 and pouch 27, as well as container 10 and the dispenser are referred to interchangeably.

The method of assembly requires the following data to be determined:

1. The Maximum and minimum pressure levels under which product (19) is to be discharged out of container (10).

2. The increases in the size of pouch (27) within container (10) at the time when its internal pressure drops sequentially from predetermined maximum to predetermined minimum pressure levels.

3. The number of the releasably closed pocket members (34) required to be disposed within pouch (27) and the order of their sequential opening within pouch (27) as the product is dispensed from container (10), the quantities of component (36) to be enclosed in each of these releasably closed pocket members (34) as well as in capsule (38), the quantity of component (37) including the solvent e.g., water in this case, to be deposited within pouch (27), and the lengths of each of the pocket and closure extension members of each of said closed pocket members according to the order of their sequential opening.

The method of assembly is depicted schematically in FIGS. (4) to (8) and (9) to (11). By heating and drawing portions of sheet (33) in a mold, cavities or pockets are formed on portions of sheet (33), and extension members to each of pockets (34) are formed on other portions of sheet (33). Each of these extensions extends from the edge of the opening of each member of pockets (34) and ends at the edge of sheet (33). Each extension ends at a predetermined distance from the edge of the opening of its pocket member. Predetermined quantities of component (36) e.g. citric acid are deposited in each member of pockets (34). Each of these quantities and the length of the extension of each pocket member are predetermined according to the order of the sequential opening of each closed pocket member in the manner to be described. Then sheet (32) is overlayed on sheet (33) and they are releasably sealed together (FIG. 5) to close each of pockets (34), and thereby form enfoldment (31). Portions of sheet (32) become liddings or closures to each member of pockets (34). Other portions of sheet (32) become extensions to each of these closure members. Each extension member extends from the edge of each closure member to the edge of wall member (32). Each extension ends at a predetermined distance from the edge of its closure member. The length of the extension of each closure is predetermined according to the order of the sequential opening in the manner to be described. Enfoldment (31) is inserted into the open end (30) of pouch (27). The exterior walls of enfoldment (31) are heat sealed together permanently by weld portions (35) as follows: The end of each extension member of pocket members (34) is affixed permanently to predetermined identified location or spot on interior wall (27d) by one of weld portions (35), and the end of each extension member of the closure members is affixed permanently to predetermined identified location or spot on interior wall (27c) by one of weld portions (35), (FIG. 8). Capsule (38) and a predetermined quantity of component (37), which includes water which may be in a frozen state are deposited within pouch (27), and then upper edge (30) is closed and heat sealed permanently to completely enclose the contents in pouch (27) and thereby complete the assembly of expulsion means (20). This expulsion means (20) is then inserted into container (10) and barrier (22) and perforated tubing (25) are put into place, and top (13) is affixed to container (10), FIG. (10).

Before the prescribed period of time for the initial generation of gas elapses, container (10) is pressurized with an inert gas (e.g. Nitrogen), at a level not less than the pressure level to be generated by the initial generation of gas.

After the prescribed period of time elapses, the frozen ingredient in component (37) melts, and capsule (38) dissolves, and the initial generation of gas generates a predetermined quantity of pressurizing gas and pressure of a lower level than the pressure surrounding expulsion assembly (20) inside container (10). Pouch (27) cannot inflate and expand, because the pressure surrounding it is higher than the pressure inside it.

After product (19) is injected by force through a port of entry into container (10) and the pressure within container (10) rises, the pressure within container (10) is adjusted by means of regulator assembly (39) to a predetermined lower pressure level, the dispenser becomes ready for use. Upon switching aerosol valve (14) to an open position, the pressurizing gas within container (10) escapes and pouch (27) inflates and expands under the pressure generated by the initial gas generation and forces product (19) to be dispensed under pressure as mentioned above.

FIGS. (3), (12), and (13) show schematically how interior walls (27c) and (27d) of pouch (27) are permanently affixed and welded at weld portions (35) to the exterior of wall members (32) and (33), and how the expansion of pouch (27) causes the closure members to separate from their respective pocket members and open and expose their content of first component (36) to admix and react with the second component (37) and water within pouch (27) and thereby generate additional predetermined quantities of the pressurizing gas.

Enfoldment (31) may also be sliced in suitable patterns to form smaller units of enfoldment (31), each comprised of a single closed pocket member (34) encapsulating a predetermined quantity of component (36). Each pocket and its closure has an extension extending to the edges of sheet (33) and (32) respectively as described above. Each of single closed pocket members (34) may be disposed within pouch (27) unattached to the other closed pocket members. Each extension of pocket members (34) ends at a predetermined distance from the edge of the opening of its respective pocket member, and each extension of the closure members ends at a predetermined distance from the edge of its respective closure member. Each of these ends defines a free end of their respective extensions.

The delay device may be constructed from gelatinous material in the form of a gelatinous capsule or a pouch which disintegrates in its surrounding within the expulsion assembly, and it may also be a container or an enclosure constructed from glass or any other suitable material, which is broken open within the expulsion assembly at any time before or after assembling the dispenser, whichever situation is suitable in the manufacturing process.

The second component of the two-component gas generation system (37) may include an ingredient in a frozen state at the time when it is deposited within pouch (27) and subsequently it liquifies.

In a dispenser of the following description, the method of determination of,

a. the increases in the pouch size each time the pressure therein drops from the predetermined maximum to the predetermined minimum pressure levels,

b. the number of closed pocket members (34) to be disposed within pouch (27).

c. the quantity of first component (36) e.g. citric acid to be encapsulated in each of closed pocket members (34) and capsule (38),

d. the length of each extension of the pocket and the closure members of each of closed pockets (34),

e. the quantity of second component (37) e.g. sodium bicarbonate and solvent, e.g. water, to be introduced into pouch (27),

The above mentioned items may be determined as follows:

It is assumed that expulsion assembly (20) comprising a bag or pouch (27) enclosing; a plurality of closed pocket members (34) containing citric acid, a gelatin capsule (38) encapsulating a predetermined quantity of citric acid, and a predetermined quantity of sodium bicarbonate and 5 cc of water, and an insignificant quantity of atmospheric air, and having displacement capacity of 12 cc, is disposed within container (10) having displacement capacity of 140 cc. One hundred (100) cc of flowable product (19) is to be introduced into the container (10) around expulsion means (20), and barrier member (22) and perforated tubing (25) are put in place, and top (13) is affixed on container (10) to close it. The aggregate head space above the liquid in container (10) and in expulsion assembly (20) is 28 cc, occupied by atmospheric air. The pressure under which product (19) is to be discharged from container (10) should be within the range of maximum pressure level of 144 psig. and minimum pressure level of 100 psig.

It is assumed that one atmospheric pressure at normal temperature measures 14.4 psig., and 144 psig. is equivalent to ten (10) atmospheric pressures.

It is assumed that the complete reaction of 1.45 gms. of citric acid with 1.9 gms. of sodium bicarbonate in aqueous medium generates 1 gm. of carbon dioxide gas, and that 1000 cc of carbon dioxide gas weigh 1.82 gms., and that 1 gm. of carbon dioxide gas measures 549.45 cc at normal temperature and pressure.

It is assumed that 0.02639 gms. of citric acid is required to completely react with enough quantity of sodium bicarbonate is aqueous medium in order to generate 1 cc of carbon dioxide gas compressed under 144 psig. (pound per square inch gauge), and 0.03458 gms. of sodium bicarbonate is required to completely react with enough quantity of citric acid in aqueous medium in order to generate 1 cc of carbon dioxide gas compressed under 144 psig.

The air in the 28 cc of head space in this dispenser pressurized under 14.4 psig., that is the number of molecules contained therein, provides a quantity of pressurized gas under 144 psig. for only 2.8 cc.

After the completion of discharging its contents of product (19), this dispenser will be capable of holding gas pressurized under 144 psig., the volume of which is calculated as follows:

100+28-2.8=125.2 cc.

The quantity of sodium bicarbonate required to react with enough quantity of citric acid to generate carbon dioxide gas compressed under 144 psig. in a space of 125.2 cc is calculated according to the above mentioned mathematical formula as follows:

125.2×0.03458=4.32 gms., rounded to 4.4 gms. of sodium bicarbonate.

(It is permitted to exceed the calculated quantity of component (37), which may help the chemical reaction.)

Following are the stages of the internal pressure in pouch (27) and the incremental expansion in the size of pouch (27) in the course of discharging product (19) out of container (10) from beginning to end;

Under normal conditions, immediately after the dispenser is assembled and before the generation of the pressurizing gas begins therein, the internal pressure within the 28 cc of head space in container (10) should measure one atmospheric pressure or 14.4 psig. An additional quantity of pressurizing gas is required to provide another 25.2 cc of pressurizing gas compressed under 144 psig. for raising the pressure in the total head space of 28 cc within container (10) to 144 psig. This 25.2 cc is the difference between 28 cc and 2.8 cc. This additional quantity of pressurizing gas is generated by reacting an additional quantity of citric acid with the sodium bicarbonate within pouch (27), which is calculated according to the above mentioned mathematical formula as follows:

25.2×0.02639=0.665 gms. citric acid.

This quantity of citric acid is encapsulated in capsule (38), which is deposited within pouch (27) together with the sodium bicarbonate and water, which may be in a frozen state. After a predetermined period of time, this capsule disintegrates or dissolves and releases its content within pouch (27). Its 0.665 gms. content of citric acid reacts with the sodium bicarbonate within pouch (27) and generates the required quantity of additional pressurizing gas which raises the pressure within this space of 28 cc to 144 psig.

Product (19) is discharged from container (10) at staggered intervals in small increments. Pouch (27) gradually expands therein and increases in size. When its internal pressure drops from 144 psig. to 100 psig. for the first time, the size of pouch (27) should expand to the size which is calculated as follows:

(28×144) divided by 100=40.32 cc., that is an increase of 12.32 cc.

This additional 12.32 cc requires an additional quantity of pressurizing gas which can be generated by reacting the following quantity of citric acid with the sodium bicarbonate within pouch (27) in order to raise the internal pressure within this dispenser to 144 psig. from 100 psig., which is calculated as follows:

12.32×0.02639=0.325 gms. citric acid.

This quantity of 0.325 gms. of citric acid is encapsulated in one of closed pocket members (34) which is disposed within pouch (27) and is scheduled to open first among the plurality of closed pocket members (34) which are scheduled to open within pouch (27).

By the same method of the calculation mentioned above, after the internal pressure within pouch (27) drops from 144 psig. to 100 psig. twice, its size increases further as follows:

40.32×1.44=58.06 cc, that is an increases of 17.74 cc.

The closed pocket member disposed within pouch (27) and scheduled to open second in sequence, should encapsulate the following quantity of citric acid in order to raise the pressure within this dispenser to 144 psig. from 100 psig., which is calculated as follows:

17.74×0.02639=0.468 gms. citric acid.

After the internal pressure within this dispenser drops from 144 psig. to 100 psig. three (3) times, the size of pouch (27) increases as follows:

58.06×1.44=83.6 cc, that is an increase of 25.546 cc.

The closed pocket member disposed within pouch (27) and scheduled to open third in sequence should encapsulate the following quantity of citric acid in order to raise the internal pressure within this dispenser to 144 psig. from 100 psig., which is calculated as follows:

25.546×0.02639=0.674 gms.

After the internal pressure within this dispenser drops from 144 psig. to 100 psig. four (4) times, the size of pouch (27) increases as follows:

83.6×1.44=120.384 cc, that is an increase of 36.784 cc.

The closed pocket member disposed within pouch (27) and scheduled to open fourth in sequence, should encapsulate the following quantity of citric acid in order to raise the pressure within this dispenser to 144 psig. from 100 psig., which is calculated as follows:

36.784×0.02639=0.97 gms. of citric acid.

However, there is only 128 cc of space available within container (10), and pouch (27) can expand additionally only another 7,616 cc, which is the difference between 128 and 120.384 c c. Consequently, the internal pressure within this dispenser cannot drop to 100 psig. when dispensing product (19) from this dispenser is completed. On the other hand, in order to have the internal pressure within this dispenser drops to a minimum of 100 psig. at the time when dispensing product (19) from this dispenser is completed, this closed pocket member which is scheduled to open fourth in sequence must encapsulate the following minimum quantity of citric acid, which is calculated as follows:

7.616×0.02639=0.2 gms. citric acid.

Accordingly, any quantity of citric acid ranging between 0.2 gms. and 0.97 gms. encapsulated within this closed pocket member which is disposed within pouch (27) and is scheduled to open fourth in sequence, will provide pressure within the range between 100 psig. and 144 psig. at the time when discharging product (19) from this dispenser is completed, and thus conform with the requirements specified for this dispenser.

The four (4) closed pocket members mentioned above are required to be disposed within pouch (27) according to the order of their sequential opening.

Items (a), (b), (c), and (e) have been determined as mentioned above. Item (d) may be determined as follows:

The length of the extension of the pocket member and the length of the extension of its respective closure member of each of closed pocket members (34) may be determined as follows:

I. An experimental pouch (27) made of transparent plastic material having two (2) facing walls (27a) and (27b). Walls (27a) and (27b) having interior walls (27c) and (27d) respectively. Each of interior walls (27c) and (27d) is marked at random with four identifiable markings or spots at suitably accessible locations forming four identifiable pairs of spots, each comprising two (2) member spots, one member spot of which is suitably located on interior wall (27c) and the other member spot is suitably located on interior wall (27d).

II. An experimental container (10) having the shape and dimensions of the container intended to be utilized in the mass production of the dispenser, and is constructed from any suitable metal or transparent material.

III. An experimental expulsion assembly (20) comprising pouch (27) described in step I, in which are deposited capsule (38) encapsulating 0.665 gms. of component (36) e.g., citric acid, and 4.4 gms. of component (37) e.g., sodium bicarbonate including 5 cc of water, in contact with each other. Then pouch (27) is closed by sealing its open end, top side (30).

IV. An experimental apparatus is assembled by disposing experimental expulsion assembly (20) of step III within experimental container (10) of step II and adding therein around expulsion assembly (20) 100 cc of product (19). Perforate tubing (25) and barrier (22) are put in place, and top (13) is affixed to container (10). Container (10) is immersed in water heated to about 60 degrees Centigrade. After elapse of a period of time of about four (4) minutes, capsule (38) has disintegrated and components (36) and (37) mix and react and produce a predetermined quantity of carbon dioxide pressurizing gas, which raises the pressure within pouch (27) to 144 psig., and this pressurized apparatus is ready to be sprayed.

V. Product (19) is discharged from container (10) at intervals in small increments, and the internal pressure within container (10) is measured after each time product (19) is discharged. Container (10) is shaken periodically. Simultaneously when the internal pressure within this apparatus drops to 100 psig. for the first time, pouch (27) expands an additional 12.32 cc within container (10) and the distances between the member spots of the identifiable pairs of spots also increase.

VI. The image of the interior of experimental container (10) and that of the experimental expulsion assembly (20), and their component parts are reproduced by an imagery process or by photography or by any other suitable process at the time when the internal pressure in container (10) drops to 100 psig. for the first time. The distance between two members of an identifiable pair of spots which are suitably located on each of interior walls (27c) and 27d), is measured.

VII. Step IV is repeated using experimental container (10), experimental expulsion assembly (20) containing 4.4 gms. of sodium bicarbonate, 5 cc of water, capsule (38) encapsulating 0.665 gms. of citric acid, and adding the first closed pocket member encapsulating 0.325 gms. of citric acid disposed within pouch (27) as follows: the total length of its pocket extension member (a) plus the length of its closure extension member (b) is made equal to the distance between the two members of the pair of the identifiable spots measured in step VI, and the end of its pocket extension member (a) and the end of its closure extension member (b) are affixed by weld portions (35) to each member of the identifiable pair of spots on interior walls (27c) and (27d) identified in step VI.

IX. Step VI is repeated, and the distance between the two members of another identifiable pair of spots, one member spot on each of walls (27c) and (27d), is measured.

X. Step VII is repeated, and in addition the second closed pocket member encapsulating 0.47 gms. of citric acid is disposed within pouch (27) as follows: the total length of its pocket extension member (a) plus the length of its closure extension member (b) is made equal to the distance between the two member of the pair of the identifiable spots measured in step IX, and the end of its pocket extension member (a) and the end of its closure extension member (b) are affixed by weld portions (35) to each member of the identifiable pair of spots on interior walls (27c) and (27d) identified in Step IX.

XI. Step VIII is repeated, allowing the internal pressure in container (10) to drop three times to 100 psig., and thereby pouch (27) has expanded an additional 25.52 cc. cc.

XII. Step IX is repeated and the distance between members of the third pair of identifiable spots, one member spot on each of walls (27c) and (27d), is measured.

XIII. Step X is repeated, and in addition, the third closed pocket member encapsulating 0.674 gms. of citric acid is disposed within pouch (27) as follows: the total length of its pocket extension member (a) plus the length of its closure extension member (b) is made equal to the distance between the two members of the pair of the identifiable spots measured in step XII, and the end of its pocket extension member (a) and the end of its closure extension member (b) are affixed by weld portions (35) to each member of the identifiable pair of spots on interior walls (27c) and (27d ) identified in step XII.

XIV. Step XI is repeated, allowing the internal pressure within container (10) to drop four times to 100 psig., and thereby pouch (27) has expanded an additional 36.75 cc.

XV. Step XII is repeated and the distance between members of the fourth pair of identifiable spots, one member spot on each of walls (27c) and (27d), is measured.

XVI. Step XIII is repeated and in addition the fourth pocket member encapsulating 0.97 gms. of citric acid is disposed within pouch (27) as follows: the total length of its pocket extension member (a) plus the length of its closure extension member (b) is made equal to the distance between the two members of the pair of the identifiable spots measured in step XV, and the end of its pocket extension member (a) and the end of its closure extension member (b) are affixed by weld portions (35) to each member of the identifiable pair of spots on interior walls (27c) and (27d) identified in step XV.

For practical purposes, the internal pressure within pouch (27) is dealt with as synonymous to that of expulsion assembly means (20) and is equivalent to the internal pressure within container (10).

All quantities, pressures, volumes and measurements given above are in approximate numbers and are presumed to be substantially accurate.

The above is the data required to manufacture and assemble the above mentioned dispenser. In mass production, expulsion assembly (20) in step XVI is duplicated, and the dispenser is assembled and completed on the production line. By following the above mentioned method, dispensers of other specifications can be processed as well.

After dispensing the product from the container is completed, the pouch will line the interior of the container.

While certain illustrative embodiments of the invention have been described with particularity, it will be understood that various other modifications will be readily apparent to those skilled in the art without departing from the scope and spirit of the invention. Accordingly, it is not intended that the scope of the claims appended hereto be limited to the description set forth herein, but rather that the claims be construed as encompassing all equivalents of the present invention which are apparent to those skilled in the art to which the invention pertains.